Much has been said about Marriage in same Gotra, this is a very hot an debated topic and people continue to twist it as per their requirements as it has been since ages with anything, People twist all rules as per their requirements and wishes and the tradition and the logical reasoning is lost as generations pass by. Today we do not know the logics of most of the things in our culture and much is forgotten because of many reasons, first is the blindly following without knowing the meanings then you continue to twist and alter as per your requirements and conditions ignoring all rules saying “Chalta hai yaar”, because mostly we do not know the science behind it, we never cared to ask and now we are running to prove it and preserve it. Our seers were true geniuses who discovered many things without spending a dime and we today spend crores on the same discoveries only to realize that the seers had laid down the rules on very scientific grounds. Marriage in same gotra was not allowed earlier and it has a very sound scientific reasoning.
First we need to understand the meaning of Gotra to understand the logic of denying marriages in same gotra. Gotra is a system which associates a person with his Root Ancestor in an Unbroken Male Lineage. It applies only to males because only males contain the “Y” Chromosomes which is passed down only between men in a Lineage, Women do not possess “Y” Chromosomes which is why women adopt the gotra of their husband after marriage, the “Y” chromosome has been identified to play a very important role in modern genetics by science in identifying the Ancestry of a person. We get a pair of Chromosomes from both parents which is 23+23=46. There is no pair for the “Y” chromosome unlike the “X” chromosome which comes in pair in a women and which can repair itself incase of damage by copying over the another DNA from other chromosomes. The “X” Chromosome of a man and “X” chromosome of a women can mix to form a pair but since Women do not have “Y” chromosomes there is no chance of pairing of “Y” chromosome in the genes incase it is damaged and it cannot replace itself by crossing on another pair of “Y” chromosome because there is no pair of “Y” chromosome as women do not have it. Thus if somebody from same gotra Marries there is a probability of the next generation having a genetic defect and the risk of defective children increases in the next 6 generation.
This has been proved by the science of genetics and hence marriage in same gotra is not encouraged, the seers knew these things so well that it surprises the scientists of today, having said this there is no thumb rule that there will be genetic defects in all those who marry in same gotra, but the danger looms large and this genetic defects can take place in your future generations to anybody may your children or grand children or their children. This genetic defects can even occur if you marry anybody from your maternal side inspite of a different gotra because even their children have the “Y” chromosome carried away from your paternal family it can cause the harm, if you want to marry anybody within same gotra you can make sure that you both are not connected to each others paternal or maternal family upto last six generations.
Again it is a personal choice of people who want to go for same gotra marriages who are in love, but it is not encouraged and atleast you can make sure that it is not somebody from your family though the meaning of same gotra technically means your root ancestor is the same person making you siblings of each other and hence marriage in same gotra is not recommended. Some people are quoting examples of kashmiri pundits marrying among themselves by changing their gotra with rituals, you can do the change with rituals for a showoff, but how are you going to change your DNA and genetics ?? Those who want to break the rules do it by making any crap reason as a valid reason.
Conclusion : It is for two people to decide whether then want to spend life with each other or not as love has no religion, caste, creed, restrictions, they can marry if they wish and nobody should interfere in the because even god says that separating two lovers is the biggest crime. Marry at your own Risk if you are too sure about spending life with your partner.